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  <div class="section" id="module-email.message">
<span id="email-message-message-representing-an-email-message-using-the-compat32-api"></span><span id="compat32-message"></span><h1>19.1.9. <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.message.Message</span></code></a>: Representing an email message using the <a class="reference internal" href="email.policy.html#email.policy.compat32" title="email.policy.compat32"><code class="xref py py-data docutils literal notranslate"><span class="pre">compat32</span></code></a> API<a class="headerlink" href="#module-email.message" title="永久链接至标题">¶</a></h1>
<p>The <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> class is very similar to the
<a class="reference internal" href="email.message.html#email.message.EmailMessage" title="email.message.EmailMessage"><code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code></a> class, without the methods added by that
class, and with the default behavior of certain other methods being slightly
different.  We also document here some methods that, while supported by the
<a class="reference internal" href="email.message.html#email.message.EmailMessage" title="email.message.EmailMessage"><code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code></a> class, are not recommended unless you are
dealing with legacy code.</p>
<p>The philosophy and structure of the two classes is otherwise the same.</p>
<p>This document describes the behavior under the default (for <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a>)
policy <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-attr docutils literal notranslate"><span class="pre">Compat32</span></code></a>.  If you are going to use another policy,
you should be using the <a class="reference internal" href="email.message.html#email.message.EmailMessage" title="email.message.EmailMessage"><code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code></a> class instead.</p>
<p>An email message consists of <em>headers</em> and a <em>payload</em>.  Headers must be
<span class="target" id="index-0"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc5233.html"><strong>RFC 5233</strong></a> style names and values, where the field name and value are
separated by a colon.  The colon is not part of either the field name or the
field value.  The payload may be a simple text message, or a binary object, or
a structured sequence of sub-messages each with their own set of headers and
their own payload.  The latter type of payload is indicated by the message
having a MIME type such as <em class="mimetype">multipart/*</em> or
<em class="mimetype">message/rfc822</em>.</p>
<p>The conceptual model provided by a <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> object is that of an
ordered dictionary of headers with additional methods for accessing both
specialized information from the headers, for accessing the payload, for
generating a serialized version of the message, and for recursively walking
over the object tree.  Note that duplicate headers are supported but special
methods must be used to access them.</p>
<p>The <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> pseudo-dictionary is indexed by the header names, which
must be ASCII values.  The values of the dictionary are strings that are
supposed to contain only ASCII characters; there is some special handling for
non-ASCII input, but it doesn't always produce the correct results.  Headers
are stored and returned in case-preserving form, but field names are matched
case-insensitively.  There may also be a single envelope header, also known as
the <em>Unix-From</em> header or the <code class="docutils literal notranslate"><span class="pre">From_</span></code> header.  The <em>payload</em> is either a
string or bytes, in the case of simple message objects, or a list of
<a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects, for MIME container documents (e.g.
<em class="mimetype">multipart/*</em> and <em class="mimetype">message/rfc822</em>).</p>
<p>Here are the methods of the <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> class:</p>
<dl class="class">
<dt id="email.message.Message">
<em class="property">class </em><code class="descclassname">email.message.</code><code class="descname">Message</code><span class="sig-paren">(</span><em>policy=compat32</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message" title="永久链接至目标">¶</a></dt>
<dd><p>If <em>policy</em> is specified (it must be an instance of a <a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal notranslate"><span class="pre">policy</span></code></a>
class) use the rules it specifies to update and serialize the representation
of the message.  If <em>policy</em> is not set, use the <a class="reference internal" href="email.policy.html#email.policy.Compat32" title="email.policy.Compat32"><code class="xref py py-class docutils literal notranslate"><span class="pre">compat32</span></code></a> policy, which maintains backward compatibility with
the Python 3.2 version of the email package.  For more information see the
<a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal notranslate"><span class="pre">policy</span></code></a> documentation.</p>
<div class="versionchanged">
<p><span class="versionmodified">在 3.3 版更改: </span>The <em>policy</em> keyword argument was added.</p>
</div>
<dl class="method">
<dt id="email.message.Message.as_string">
<code class="descname">as_string</code><span class="sig-paren">(</span><em>unixfrom=False</em>, <em>maxheaderlen=0</em>, <em>policy=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.as_string" title="永久链接至目标">¶</a></dt>
<dd><p>Return the entire message flattened as a string.  When optional <em>unixfrom</em>
is true, the envelope header is included in the returned string.
<em>unixfrom</em> defaults to <code class="docutils literal notranslate"><span class="pre">False</span></code>.  For backward compatibility reasons,
<em>maxheaderlen</em> defaults to <code class="docutils literal notranslate"><span class="pre">0</span></code>, so if you want a different value you
must override it explicitly (the value specified for <em>max_line_length</em> in
the policy will be ignored by this method).  The <em>policy</em> argument may be
used to override the default policy obtained from the message instance.
This can be used to control some of the formatting produced by the
method, since the specified <em>policy</em> will be passed to the <code class="docutils literal notranslate"><span class="pre">Generator</span></code>.</p>
<p>Flattening the message may trigger changes to the <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> if
defaults need to be filled in to complete the transformation to a string
(for example, MIME boundaries may be generated or modified).</p>
<p>Note that this method is provided as a convenience and may not always
format the message the way you want.  For example, by default it does
not do the mangling of lines that begin with <code class="docutils literal notranslate"><span class="pre">From</span></code> that is
required by the unix mbox format.  For more flexibility, instantiate a
<a class="reference internal" href="email.generator.html#email.generator.Generator" title="email.generator.Generator"><code class="xref py py-class docutils literal notranslate"><span class="pre">Generator</span></code></a> instance and use its
<a class="reference internal" href="email.generator.html#email.generator.Generator.flatten" title="email.generator.Generator.flatten"><code class="xref py py-meth docutils literal notranslate"><span class="pre">flatten()</span></code></a> method directly.  For example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">io</span> <span class="k">import</span> <span class="n">StringIO</span>
<span class="kn">from</span> <span class="nn">email.generator</span> <span class="k">import</span> <span class="n">Generator</span>
<span class="n">fp</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">()</span>
<span class="n">g</span> <span class="o">=</span> <span class="n">Generator</span><span class="p">(</span><span class="n">fp</span><span class="p">,</span> <span class="n">mangle_from_</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">maxheaderlen</span><span class="o">=</span><span class="mi">60</span><span class="p">)</span>
<span class="n">g</span><span class="o">.</span><span class="n">flatten</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">fp</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span>
</pre></div>
</div>
<p>If the message object contains binary data that is not encoded according
to RFC standards, the non-compliant data will be replaced by unicode
&quot;unknown character&quot; code points.  (See also <a class="reference internal" href="#email.message.Message.as_bytes" title="email.message.Message.as_bytes"><code class="xref py py-meth docutils literal notranslate"><span class="pre">as_bytes()</span></code></a> and
<a class="reference internal" href="email.generator.html#email.generator.BytesGenerator" title="email.generator.BytesGenerator"><code class="xref py py-class docutils literal notranslate"><span class="pre">BytesGenerator</span></code></a>.)</p>
<div class="versionchanged">
<p><span class="versionmodified">在 3.4 版更改: </span>the <em>policy</em> keyword argument was added.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.__str__">
<code class="descname">__str__</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.__str__" title="永久链接至目标">¶</a></dt>
<dd><p>Equivalent to <a class="reference internal" href="#email.message.Message.as_string" title="email.message.Message.as_string"><code class="xref py py-meth docutils literal notranslate"><span class="pre">as_string()</span></code></a>.  Allows <code class="docutils literal notranslate"><span class="pre">str(msg)</span></code> to produce a
string containing the formatted message.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.as_bytes">
<code class="descname">as_bytes</code><span class="sig-paren">(</span><em>unixfrom=False</em>, <em>policy=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.as_bytes" title="永久链接至目标">¶</a></dt>
<dd><p>Return the entire message flattened as a bytes object.  When optional
<em>unixfrom</em> is true, the envelope header is included in the returned
string.  <em>unixfrom</em> defaults to <code class="docutils literal notranslate"><span class="pre">False</span></code>.  The <em>policy</em> argument may be
used to override the default policy obtained from the message instance.
This can be used to control some of the formatting produced by the
method, since the specified <em>policy</em> will be passed to the
<code class="docutils literal notranslate"><span class="pre">BytesGenerator</span></code>.</p>
<p>Flattening the message may trigger changes to the <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> if
defaults need to be filled in to complete the transformation to a string
(for example, MIME boundaries may be generated or modified).</p>
<p>Note that this method is provided as a convenience and may not always
format the message the way you want.  For example, by default it does
not do the mangling of lines that begin with <code class="docutils literal notranslate"><span class="pre">From</span></code> that is
required by the unix mbox format.  For more flexibility, instantiate a
<a class="reference internal" href="email.generator.html#email.generator.BytesGenerator" title="email.generator.BytesGenerator"><code class="xref py py-class docutils literal notranslate"><span class="pre">BytesGenerator</span></code></a> instance and use its
<a class="reference internal" href="email.generator.html#email.generator.BytesGenerator.flatten" title="email.generator.BytesGenerator.flatten"><code class="xref py py-meth docutils literal notranslate"><span class="pre">flatten()</span></code></a> method directly.
For example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">io</span> <span class="k">import</span> <span class="n">BytesIO</span>
<span class="kn">from</span> <span class="nn">email.generator</span> <span class="k">import</span> <span class="n">BytesGenerator</span>
<span class="n">fp</span> <span class="o">=</span> <span class="n">BytesIO</span><span class="p">()</span>
<span class="n">g</span> <span class="o">=</span> <span class="n">BytesGenerator</span><span class="p">(</span><span class="n">fp</span><span class="p">,</span> <span class="n">mangle_from_</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">maxheaderlen</span><span class="o">=</span><span class="mi">60</span><span class="p">)</span>
<span class="n">g</span><span class="o">.</span><span class="n">flatten</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">fp</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified">3.4 新版功能.</span></p>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.__bytes__">
<code class="descname">__bytes__</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.__bytes__" title="永久链接至目标">¶</a></dt>
<dd><p>Equivalent to <a class="reference internal" href="#email.message.Message.as_bytes" title="email.message.Message.as_bytes"><code class="xref py py-meth docutils literal notranslate"><span class="pre">as_bytes()</span></code></a>.  Allows <code class="docutils literal notranslate"><span class="pre">bytes(msg)</span></code> to produce a
bytes object containing the formatted message.</p>
<div class="versionadded">
<p><span class="versionmodified">3.4 新版功能.</span></p>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.is_multipart">
<code class="descname">is_multipart</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.is_multipart" title="永久链接至目标">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the message's payload is a list of sub-<a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects, otherwise return <code class="docutils literal notranslate"><span class="pre">False</span></code>.  When
<a class="reference internal" href="#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> returns <code class="docutils literal notranslate"><span class="pre">False</span></code>, the payload should be a string
object (which might be a CTE encoded binary payload.  (Note that
<a class="reference internal" href="#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> returning <code class="docutils literal notranslate"><span class="pre">True</span></code> does not necessarily mean that
&quot;msg.get_content_maintype() == 'multipart'&quot; will return the <code class="docutils literal notranslate"><span class="pre">True</span></code>.
For example, <code class="docutils literal notranslate"><span class="pre">is_multipart</span></code> will return <code class="docutils literal notranslate"><span class="pre">True</span></code> when the
<a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> is of type <code class="docutils literal notranslate"><span class="pre">message/rfc822</span></code>.)</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.set_unixfrom">
<code class="descname">set_unixfrom</code><span class="sig-paren">(</span><em>unixfrom</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.set_unixfrom" title="永久链接至目标">¶</a></dt>
<dd><p>Set the message's envelope header to <em>unixfrom</em>, which should be a string.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_unixfrom">
<code class="descname">get_unixfrom</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_unixfrom" title="永久链接至目标">¶</a></dt>
<dd><p>Return the message's envelope header.  Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code> if the
envelope header was never set.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.attach">
<code class="descname">attach</code><span class="sig-paren">(</span><em>payload</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.attach" title="永久链接至目标">¶</a></dt>
<dd><p>Add the given <em>payload</em> to the current payload, which must be <code class="docutils literal notranslate"><span class="pre">None</span></code> or
a list of <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects before the call. After the call, the
payload will always be a list of <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects.  If you want to
set the payload to a scalar object (e.g. a string), use
<a class="reference internal" href="#email.message.Message.set_payload" title="email.message.Message.set_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_payload()</span></code></a> instead.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class its functionality is
replaced by <a class="reference internal" href="email.message.html#email.message.EmailMessage.set_content" title="email.message.EmailMessage.set_content"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_content()</span></code></a> and the
related <code class="docutils literal notranslate"><span class="pre">make</span></code> and <code class="docutils literal notranslate"><span class="pre">add</span></code> methods.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_payload">
<code class="descname">get_payload</code><span class="sig-paren">(</span><em>i=None</em>, <em>decode=False</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_payload" title="永久链接至目标">¶</a></dt>
<dd><p>Return the current payload, which will be a list of
<a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects when <a class="reference internal" href="#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> is <code class="docutils literal notranslate"><span class="pre">True</span></code>, or a
string when <a class="reference internal" href="#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> is <code class="docutils literal notranslate"><span class="pre">False</span></code>.  If the payload is a list
and you mutate the list object, you modify the message's payload in place.</p>
<p>With optional argument <em>i</em>, <a class="reference internal" href="#email.message.Message.get_payload" title="email.message.Message.get_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_payload()</span></code></a> will return the <em>i</em>-th
element of the payload, counting from zero, if <a class="reference internal" href="#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> is
<code class="docutils literal notranslate"><span class="pre">True</span></code>.  An <a class="reference internal" href="exceptions.html#IndexError" title="IndexError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a> will be raised if <em>i</em> is less than 0 or
greater than or equal to the number of items in the payload.  If the
payload is a string (i.e.  <a class="reference internal" href="#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> is <code class="docutils literal notranslate"><span class="pre">False</span></code>) and <em>i</em> is
given, a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised.</p>
<p>Optional <em>decode</em> is a flag indicating whether the payload should be
decoded or not, according to the <em class="mailheader">Content-Transfer-Encoding</em>
header. When <code class="docutils literal notranslate"><span class="pre">True</span></code> and the message is not a multipart, the payload will
be decoded if this header's value is <code class="docutils literal notranslate"><span class="pre">quoted-printable</span></code> or <code class="docutils literal notranslate"><span class="pre">base64</span></code>.
If some other encoding is used, or <em class="mailheader">Content-Transfer-Encoding</em>
header is missing, the payload is
returned as-is (undecoded).  In all cases the returned value is binary
data.  If the message is a multipart and the <em>decode</em> flag is <code class="docutils literal notranslate"><span class="pre">True</span></code>,
then <code class="docutils literal notranslate"><span class="pre">None</span></code> is returned.  If the payload is base64 and it was not
perfectly formed (missing padding, characters outside the base64
alphabet), then an appropriate defect will be added to the message's
defect property (<code class="xref py py-class docutils literal notranslate"><span class="pre">InvalidBase64PaddingDefect</span></code> or
<code class="xref py py-class docutils literal notranslate"><span class="pre">InvalidBase64CharactersDefect</span></code>, respectively).</p>
<p>When <em>decode</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code> (the default) the body is returned as a string
without decoding the <em class="mailheader">Content-Transfer-Encoding</em>.  However,
for a <em class="mailheader">Content-Transfer-Encoding</em> of 8bit, an attempt is made
to decode the original bytes using the <code class="docutils literal notranslate"><span class="pre">charset</span></code> specified by the
<em class="mailheader">Content-Type</em> header, using the <code class="docutils literal notranslate"><span class="pre">replace</span></code> error handler.
If no <code class="docutils literal notranslate"><span class="pre">charset</span></code> is specified, or if the <code class="docutils literal notranslate"><span class="pre">charset</span></code> given is not
recognized by the email package, the body is decoded using the default
ASCII charset.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class its functionality is
replaced by <a class="reference internal" href="email.message.html#email.message.EmailMessage.get_content" title="email.message.EmailMessage.get_content"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_content()</span></code></a> and
<a class="reference internal" href="email.message.html#email.message.EmailMessage.iter_parts" title="email.message.EmailMessage.iter_parts"><code class="xref py py-meth docutils literal notranslate"><span class="pre">iter_parts()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.set_payload">
<code class="descname">set_payload</code><span class="sig-paren">(</span><em>payload</em>, <em>charset=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.set_payload" title="永久链接至目标">¶</a></dt>
<dd><p>Set the entire message object's payload to <em>payload</em>.  It is the client's
responsibility to ensure the payload invariants.  Optional <em>charset</em> sets
the message's default character set; see <a class="reference internal" href="#email.message.Message.set_charset" title="email.message.Message.set_charset"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_charset()</span></code></a> for details.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class its functionality is
replaced by <a class="reference internal" href="email.message.html#email.message.EmailMessage.set_content" title="email.message.EmailMessage.set_content"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_content()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.set_charset">
<code class="descname">set_charset</code><span class="sig-paren">(</span><em>charset</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.set_charset" title="永久链接至目标">¶</a></dt>
<dd><p>Set the character set of the payload to <em>charset</em>, which can either be a
<a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instance (see <a class="reference internal" href="email.charset.html#module-email.charset" title="email.charset: Character Sets"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.charset</span></code></a>), a
string naming a character set, or <code class="docutils literal notranslate"><span class="pre">None</span></code>.  If it is a string, it will
be converted to a <a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instance.  If <em>charset</em>
is <code class="docutils literal notranslate"><span class="pre">None</span></code>, the <code class="docutils literal notranslate"><span class="pre">charset</span></code> parameter will be removed from the
<em class="mailheader">Content-Type</em> header (the message will not be otherwise
modified).  Anything else will generate a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a>.</p>
<p>If there is no existing <em class="mailheader">MIME-Version</em> header one will be
added.  If there is no existing <em class="mailheader">Content-Type</em> header, one
will be added with a value of <em class="mimetype">text/plain</em>.  Whether the
<em class="mailheader">Content-Type</em> header already exists or not, its <code class="docutils literal notranslate"><span class="pre">charset</span></code>
parameter will be set to <em>charset.output_charset</em>.   If
<em>charset.input_charset</em> and <em>charset.output_charset</em> differ, the payload
will be re-encoded to the <em>output_charset</em>.  If there is no existing
<em class="mailheader">Content-Transfer-Encoding</em> header, then the payload will be
transfer-encoded, if needed, using the specified
<a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a>, and a header with the appropriate value
will be added.  If a <em class="mailheader">Content-Transfer-Encoding</em> header
already exists, the payload is assumed to already be correctly encoded
using that <em class="mailheader">Content-Transfer-Encoding</em> and is not modified.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class its functionality is
replaced by the <em>charset</em> parameter of the
<code class="xref py py-meth docutils literal notranslate"><span class="pre">email.emailmessage.EmailMessage.set_content()</span></code> method.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_charset">
<code class="descname">get_charset</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_charset" title="永久链接至目标">¶</a></dt>
<dd><p>Return the <a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instance associated with the
message's payload.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class it always returns
<code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
</dd></dl>

<p>The following methods implement a mapping-like interface for accessing the
message's <span class="target" id="index-1"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2822.html"><strong>RFC 2822</strong></a> headers.  Note that there are some semantic differences
between these methods and a normal mapping (i.e. dictionary) interface.  For
example, in a dictionary there are no duplicate keys, but here there may be
duplicate message headers.  Also, in dictionaries there is no guaranteed
order to the keys returned by <a class="reference internal" href="#email.message.Message.keys" title="email.message.Message.keys"><code class="xref py py-meth docutils literal notranslate"><span class="pre">keys()</span></code></a>, but in a <a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> object,
headers are always returned in the order they appeared in the original
message, or were added to the message later.  Any header deleted and then
re-added are always appended to the end of the header list.</p>
<p>These semantic differences are intentional and are biased toward maximal
convenience.</p>
<p>Note that in all cases, any envelope header present in the message is not
included in the mapping interface.</p>
<p>In a model generated from bytes, any header values that (in contravention of
the RFCs) contain non-ASCII bytes will, when retrieved through this
interface, be represented as <a class="reference internal" href="email.header.html#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate"><span class="pre">Header</span></code></a> objects with
a charset of <cite>unknown-8bit</cite>.</p>
<dl class="method">
<dt id="email.message.Message.__len__">
<code class="descname">__len__</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.__len__" title="永久链接至目标">¶</a></dt>
<dd><p>Return the total number of headers, including duplicates.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.__contains__">
<code class="descname">__contains__</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.__contains__" title="永久链接至目标">¶</a></dt>
<dd><p>Return true if the message object has a field named <em>name</em>. Matching is
done case-insensitively and <em>name</em> should not include the trailing colon.
Used for the <code class="docutils literal notranslate"><span class="pre">in</span></code> operator, e.g.:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="s1">&#39;message-id&#39;</span> <span class="ow">in</span> <span class="n">myMessage</span><span class="p">:</span>
   <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;Message-ID:&#39;</span><span class="p">,</span> <span class="n">myMessage</span><span class="p">[</span><span class="s1">&#39;message-id&#39;</span><span class="p">])</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.__getitem__">
<code class="descname">__getitem__</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.__getitem__" title="永久链接至目标">¶</a></dt>
<dd><p>Return the value of the named header field.  <em>name</em> should not include the
colon field separator.  If the header is missing, <code class="docutils literal notranslate"><span class="pre">None</span></code> is returned; a
<a class="reference internal" href="exceptions.html#KeyError" title="KeyError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">KeyError</span></code></a> is never raised.</p>
<p>Note that if the named field appears more than once in the message's
headers, exactly which of those field values will be returned is
undefined.  Use the <a class="reference internal" href="#email.message.Message.get_all" title="email.message.Message.get_all"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_all()</span></code></a> method to get the values of all the
extant named headers.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.__setitem__">
<code class="descname">__setitem__</code><span class="sig-paren">(</span><em>name</em>, <em>val</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.__setitem__" title="永久链接至目标">¶</a></dt>
<dd><p>Add a header to the message with field name <em>name</em> and value <em>val</em>.  The
field is appended to the end of the message's existing fields.</p>
<p>Note that this does <em>not</em> overwrite or delete any existing header with the same
name.  If you want to ensure that the new header is the only one present in the
message with field name <em>name</em>, delete the field first, e.g.:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">del</span> <span class="n">msg</span><span class="p">[</span><span class="s1">&#39;subject&#39;</span><span class="p">]</span>
<span class="n">msg</span><span class="p">[</span><span class="s1">&#39;subject&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;Python roolz!&#39;</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.__delitem__">
<code class="descname">__delitem__</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.__delitem__" title="永久链接至目标">¶</a></dt>
<dd><p>Delete all occurrences of the field with name <em>name</em> from the message's
headers.  No exception is raised if the named field isn't present in the
headers.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.keys">
<code class="descname">keys</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.keys" title="永久链接至目标">¶</a></dt>
<dd><p>Return a list of all the message's header field names.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.values">
<code class="descname">values</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.values" title="永久链接至目标">¶</a></dt>
<dd><p>Return a list of all the message's field values.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.items">
<code class="descname">items</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.items" title="永久链接至目标">¶</a></dt>
<dd><p>Return a list of 2-tuples containing all the message's field headers and
values.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get">
<code class="descname">get</code><span class="sig-paren">(</span><em>name</em>, <em>failobj=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get" title="永久链接至目标">¶</a></dt>
<dd><p>Return the value of the named header field.  This is identical to
<a class="reference internal" href="#email.message.Message.__getitem__" title="email.message.Message.__getitem__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__getitem__()</span></code></a> except that optional <em>failobj</em> is returned if the
named header is missing (defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code>).</p>
</dd></dl>

<p>Here are some additional useful methods:</p>
<dl class="method">
<dt id="email.message.Message.get_all">
<code class="descname">get_all</code><span class="sig-paren">(</span><em>name</em>, <em>failobj=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_all" title="永久链接至目标">¶</a></dt>
<dd><p>Return a list of all the values for the field named <em>name</em>. If there are
no such named headers in the message, <em>failobj</em> is returned (defaults to
<code class="docutils literal notranslate"><span class="pre">None</span></code>).</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.add_header">
<code class="descname">add_header</code><span class="sig-paren">(</span><em>_name</em>, <em>_value</em>, <em>**_params</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.add_header" title="永久链接至目标">¶</a></dt>
<dd><p>Extended header setting.  This method is similar to <a class="reference internal" href="#email.message.Message.__setitem__" title="email.message.Message.__setitem__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__setitem__()</span></code></a>
except that additional header parameters can be provided as keyword
arguments.  <em>_name</em> is the header field to add and <em>_value</em> is the
<em>primary</em> value for the header.</p>
<p>For each item in the keyword argument dictionary <em>_params</em>, the key is
taken as the parameter name, with underscores converted to dashes (since
dashes are illegal in Python identifiers).  Normally, the parameter will
be added as <code class="docutils literal notranslate"><span class="pre">key=&quot;value&quot;</span></code> unless the value is <code class="docutils literal notranslate"><span class="pre">None</span></code>, in which case
only the key will be added.  If the value contains non-ASCII characters,
it can be specified as a three tuple in the format
<code class="docutils literal notranslate"><span class="pre">(CHARSET,</span> <span class="pre">LANGUAGE,</span> <span class="pre">VALUE)</span></code>, where <code class="docutils literal notranslate"><span class="pre">CHARSET</span></code> is a string naming the
charset to be used to encode the value, <code class="docutils literal notranslate"><span class="pre">LANGUAGE</span></code> can usually be set
to <code class="docutils literal notranslate"><span class="pre">None</span></code> or the empty string (see <span class="target" id="index-2"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2231.html"><strong>RFC 2231</strong></a> for other possibilities),
and <code class="docutils literal notranslate"><span class="pre">VALUE</span></code> is the string value containing non-ASCII code points.  If
a three tuple is not passed and the value contains non-ASCII characters,
it is automatically encoded in <span class="target" id="index-3"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2231.html"><strong>RFC 2231</strong></a> format using a <code class="docutils literal notranslate"><span class="pre">CHARSET</span></code>
of <code class="docutils literal notranslate"><span class="pre">utf-8</span></code> and a <code class="docutils literal notranslate"><span class="pre">LANGUAGE</span></code> of <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
<p>Here's an example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">msg</span><span class="o">.</span><span class="n">add_header</span><span class="p">(</span><span class="s1">&#39;Content-Disposition&#39;</span><span class="p">,</span> <span class="s1">&#39;attachment&#39;</span><span class="p">,</span> <span class="n">filename</span><span class="o">=</span><span class="s1">&#39;bud.gif&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>This will add a header that looks like</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">Content</span><span class="o">-</span><span class="n">Disposition</span><span class="p">:</span> <span class="n">attachment</span><span class="p">;</span> <span class="n">filename</span><span class="o">=</span><span class="s2">&quot;bud.gif&quot;</span>
</pre></div>
</div>
<p>An example with non-ASCII characters:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">msg</span><span class="o">.</span><span class="n">add_header</span><span class="p">(</span><span class="s1">&#39;Content-Disposition&#39;</span><span class="p">,</span> <span class="s1">&#39;attachment&#39;</span><span class="p">,</span>
               <span class="n">filename</span><span class="o">=</span><span class="p">(</span><span class="s1">&#39;iso-8859-1&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">,</span> <span class="s1">&#39;Fußballer.ppt&#39;</span><span class="p">))</span>
</pre></div>
</div>
<p>Which produces</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">Content</span><span class="o">-</span><span class="n">Disposition</span><span class="p">:</span> <span class="n">attachment</span><span class="p">;</span> <span class="n">filename</span><span class="o">*=</span><span class="s2">&quot;iso-8859-1&#39;&#39;Fu%DFballer.ppt&quot;</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.replace_header">
<code class="descname">replace_header</code><span class="sig-paren">(</span><em>_name</em>, <em>_value</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.replace_header" title="永久链接至目标">¶</a></dt>
<dd><p>Replace a header.  Replace the first header found in the message that
matches <em>_name</em>, retaining header order and field name case.  If no
matching header was found, a <a class="reference internal" href="exceptions.html#KeyError" title="KeyError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">KeyError</span></code></a> is raised.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_content_type">
<code class="descname">get_content_type</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_content_type" title="永久链接至目标">¶</a></dt>
<dd><p>Return the message's content type.  The returned string is coerced to
lower case of the form <em class="mimetype">maintype/subtype</em>.  If there was no
<em class="mailheader">Content-Type</em> header in the message the default type as given
by <a class="reference internal" href="#email.message.Message.get_default_type" title="email.message.Message.get_default_type"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_default_type()</span></code></a> will be returned.  Since according to
<span class="target" id="index-4"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a>, messages always have a default type, <a class="reference internal" href="#email.message.Message.get_content_type" title="email.message.Message.get_content_type"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_content_type()</span></code></a>
will always return a value.</p>
<p><span class="target" id="index-5"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a> defines a message's default type to be <em class="mimetype">text/plain</em>
unless it appears inside a <em class="mimetype">multipart/digest</em> container, in
which case it would be <em class="mimetype">message/rfc822</em>.  If the
<em class="mailheader">Content-Type</em> header has an invalid type specification,
<span class="target" id="index-6"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a> mandates that the default type be <em class="mimetype">text/plain</em>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_content_maintype">
<code class="descname">get_content_maintype</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_content_maintype" title="永久链接至目标">¶</a></dt>
<dd><p>Return the message's main content type.  This is the <em class="mimetype">maintype</em>
part of the string returned by <a class="reference internal" href="#email.message.Message.get_content_type" title="email.message.Message.get_content_type"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_content_type()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_content_subtype">
<code class="descname">get_content_subtype</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_content_subtype" title="永久链接至目标">¶</a></dt>
<dd><p>Return the message's sub-content type.  This is the <em class="mimetype">subtype</em>
part of the string returned by <a class="reference internal" href="#email.message.Message.get_content_type" title="email.message.Message.get_content_type"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_content_type()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_default_type">
<code class="descname">get_default_type</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_default_type" title="永久链接至目标">¶</a></dt>
<dd><p>Return the default content type.  Most messages have a default content
type of <em class="mimetype">text/plain</em>, except for messages that are subparts of
<em class="mimetype">multipart/digest</em> containers.  Such subparts have a default
content type of <em class="mimetype">message/rfc822</em>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.set_default_type">
<code class="descname">set_default_type</code><span class="sig-paren">(</span><em>ctype</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.set_default_type" title="永久链接至目标">¶</a></dt>
<dd><p>Set the default content type.  <em>ctype</em> should either be
<em class="mimetype">text/plain</em> or <em class="mimetype">message/rfc822</em>, although this is not
enforced.  The default content type is not stored in the
<em class="mailheader">Content-Type</em> header.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_params">
<code class="descname">get_params</code><span class="sig-paren">(</span><em>failobj=None</em>, <em>header='content-type'</em>, <em>unquote=True</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_params" title="永久链接至目标">¶</a></dt>
<dd><p>Return the message's <em class="mailheader">Content-Type</em> parameters, as a list.
The elements of the returned list are 2-tuples of key/value pairs, as
split on the <code class="docutils literal notranslate"><span class="pre">'='</span></code> sign.  The left hand side of the <code class="docutils literal notranslate"><span class="pre">'='</span></code> is the key,
while the right hand side is the value.  If there is no <code class="docutils literal notranslate"><span class="pre">'='</span></code> sign in
the parameter the value is the empty string, otherwise the value is as
described in <a class="reference internal" href="#email.message.Message.get_param" title="email.message.Message.get_param"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_param()</span></code></a> and is unquoted if optional <em>unquote</em> is
<code class="docutils literal notranslate"><span class="pre">True</span></code> (the default).</p>
<p>Optional <em>failobj</em> is the object to return if there is no
<em class="mailheader">Content-Type</em> header.  Optional <em>header</em> is the header to
search instead of <em class="mailheader">Content-Type</em>.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class its functionality is
replaced by the <em>params</em> property of the individual header objects
returned by the header access methods.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_param">
<code class="descname">get_param</code><span class="sig-paren">(</span><em>param</em>, <em>failobj=None</em>, <em>header='content-type'</em>, <em>unquote=True</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_param" title="永久链接至目标">¶</a></dt>
<dd><p>Return the value of the <em class="mailheader">Content-Type</em> header's parameter
<em>param</em> as a string.  If the message has no <em class="mailheader">Content-Type</em>
header or if there is no such parameter, then <em>failobj</em> is returned
(defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code>).</p>
<p>Optional <em>header</em> if given, specifies the message header to use instead of
<em class="mailheader">Content-Type</em>.</p>
<p>Parameter keys are always compared case insensitively.  The return value
can either be a string, or a 3-tuple if the parameter was <span class="target" id="index-7"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2231.html"><strong>RFC 2231</strong></a>
encoded.  When it's a 3-tuple, the elements of the value are of the form
<code class="docutils literal notranslate"><span class="pre">(CHARSET,</span> <span class="pre">LANGUAGE,</span> <span class="pre">VALUE)</span></code>.  Note that both <code class="docutils literal notranslate"><span class="pre">CHARSET</span></code> and
<code class="docutils literal notranslate"><span class="pre">LANGUAGE</span></code> can be <code class="docutils literal notranslate"><span class="pre">None</span></code>, in which case you should consider <code class="docutils literal notranslate"><span class="pre">VALUE</span></code>
to be encoded in the <code class="docutils literal notranslate"><span class="pre">us-ascii</span></code> charset.  You can usually ignore
<code class="docutils literal notranslate"><span class="pre">LANGUAGE</span></code>.</p>
<p>If your application doesn't care whether the parameter was encoded as in
<span class="target" id="index-8"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2231.html"><strong>RFC 2231</strong></a>, you can collapse the parameter value by calling
<a class="reference internal" href="email.util.html#email.utils.collapse_rfc2231_value" title="email.utils.collapse_rfc2231_value"><code class="xref py py-func docutils literal notranslate"><span class="pre">email.utils.collapse_rfc2231_value()</span></code></a>, passing in the return value
from <a class="reference internal" href="#email.message.Message.get_param" title="email.message.Message.get_param"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_param()</span></code></a>.  This will return a suitably decoded Unicode
string when the value is a tuple, or the original string unquoted if it
isn't.  For example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">rawparam</span> <span class="o">=</span> <span class="n">msg</span><span class="o">.</span><span class="n">get_param</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span>
<span class="n">param</span> <span class="o">=</span> <span class="n">email</span><span class="o">.</span><span class="n">utils</span><span class="o">.</span><span class="n">collapse_rfc2231_value</span><span class="p">(</span><span class="n">rawparam</span><span class="p">)</span>
</pre></div>
</div>
<p>In any case, the parameter value (either the returned string, or the
<code class="docutils literal notranslate"><span class="pre">VALUE</span></code> item in the 3-tuple) is always unquoted, unless <em>unquote</em> is set
to <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class its functionality is
replaced by the <em>params</em> property of the individual header objects
returned by the header access methods.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.set_param">
<code class="descname">set_param</code><span class="sig-paren">(</span><em>param</em>, <em>value</em>, <em>header='Content-Type'</em>, <em>requote=True</em>, <em>charset=None</em>, <em>language=''</em>, <em>replace=False</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.set_param" title="永久链接至目标">¶</a></dt>
<dd><p>Set a parameter in the <em class="mailheader">Content-Type</em> header.  If the
parameter already exists in the header, its value will be replaced with
<em>value</em>.  If the <em class="mailheader">Content-Type</em> header as not yet been defined
for this message, it will be set to <em class="mimetype">text/plain</em> and the new
parameter value will be appended as per <span class="target" id="index-9"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2045.html"><strong>RFC 2045</strong></a>.</p>
<p>Optional <em>header</em> specifies an alternative header to
<em class="mailheader">Content-Type</em>, and all parameters will be quoted as necessary
unless optional <em>requote</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code> (the default is <code class="docutils literal notranslate"><span class="pre">True</span></code>).</p>
<p>If optional <em>charset</em> is specified, the parameter will be encoded
according to <span class="target" id="index-10"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2231.html"><strong>RFC 2231</strong></a>. Optional <em>language</em> specifies the RFC 2231
language, defaulting to the empty string.  Both <em>charset</em> and <em>language</em>
should be strings.</p>
<p>If <em>replace</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code> (the default) the header is moved to the
end of the list of headers.  If <em>replace</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code>, the header
will be updated in place.</p>
<div class="versionchanged">
<p><span class="versionmodified">在 3.4 版更改: </span><code class="docutils literal notranslate"><span class="pre">replace</span></code> keyword was added.</p>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.del_param">
<code class="descname">del_param</code><span class="sig-paren">(</span><em>param</em>, <em>header='content-type'</em>, <em>requote=True</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.del_param" title="永久链接至目标">¶</a></dt>
<dd><p>Remove the given parameter completely from the <em class="mailheader">Content-Type</em>
header.  The header will be re-written in place without the parameter or
its value.  All values will be quoted as necessary unless <em>requote</em> is
<code class="docutils literal notranslate"><span class="pre">False</span></code> (the default is <code class="docutils literal notranslate"><span class="pre">True</span></code>).  Optional <em>header</em> specifies an
alternative to <em class="mailheader">Content-Type</em>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.set_type">
<code class="descname">set_type</code><span class="sig-paren">(</span><em>type</em>, <em>header='Content-Type'</em>, <em>requote=True</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.set_type" title="永久链接至目标">¶</a></dt>
<dd><p>Set the main type and subtype for the <em class="mailheader">Content-Type</em>
header. <em>type</em> must be a string in the form <em class="mimetype">maintype/subtype</em>,
otherwise a <a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> is raised.</p>
<p>This method replaces the <em class="mailheader">Content-Type</em> header, keeping all
the parameters in place.  If <em>requote</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code>, this leaves the
existing header's quoting as is, otherwise the parameters will be quoted
(the default).</p>
<p>An alternative header can be specified in the <em>header</em> argument. When the
<em class="mailheader">Content-Type</em> header is set a <em class="mailheader">MIME-Version</em>
header is also added.</p>
<p>This is a legacy method.  On the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EmailMessage</span></code> class its functionality is
replaced by the <code class="docutils literal notranslate"><span class="pre">make_</span></code> and <code class="docutils literal notranslate"><span class="pre">add_</span></code> methods.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_filename">
<code class="descname">get_filename</code><span class="sig-paren">(</span><em>failobj=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_filename" title="永久链接至目标">¶</a></dt>
<dd><p>Return the value of the <code class="docutils literal notranslate"><span class="pre">filename</span></code> parameter of the
<em class="mailheader">Content-Disposition</em> header of the message.  If the header
does not have a <code class="docutils literal notranslate"><span class="pre">filename</span></code> parameter, this method falls back to looking
for the <code class="docutils literal notranslate"><span class="pre">name</span></code> parameter on the <em class="mailheader">Content-Type</em> header.  If
neither is found, or the header is missing, then <em>failobj</em> is returned.
The returned string will always be unquoted as per
<a class="reference internal" href="email.util.html#email.utils.unquote" title="email.utils.unquote"><code class="xref py py-func docutils literal notranslate"><span class="pre">email.utils.unquote()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_boundary">
<code class="descname">get_boundary</code><span class="sig-paren">(</span><em>failobj=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_boundary" title="永久链接至目标">¶</a></dt>
<dd><p>Return the value of the <code class="docutils literal notranslate"><span class="pre">boundary</span></code> parameter of the
<em class="mailheader">Content-Type</em> header of the message, or <em>failobj</em> if either
the header is missing, or has no <code class="docutils literal notranslate"><span class="pre">boundary</span></code> parameter.  The returned
string will always be unquoted as per <a class="reference internal" href="email.util.html#email.utils.unquote" title="email.utils.unquote"><code class="xref py py-func docutils literal notranslate"><span class="pre">email.utils.unquote()</span></code></a>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.set_boundary">
<code class="descname">set_boundary</code><span class="sig-paren">(</span><em>boundary</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.set_boundary" title="永久链接至目标">¶</a></dt>
<dd><p>Set the <code class="docutils literal notranslate"><span class="pre">boundary</span></code> parameter of the <em class="mailheader">Content-Type</em> header to
<em>boundary</em>.  <a class="reference internal" href="#email.message.Message.set_boundary" title="email.message.Message.set_boundary"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_boundary()</span></code></a> will always quote <em>boundary</em> if
necessary.  A <a class="reference internal" href="email.errors.html#email.errors.HeaderParseError" title="email.errors.HeaderParseError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">HeaderParseError</span></code></a> is raised if the
message object has no <em class="mailheader">Content-Type</em> header.</p>
<p>Note that using this method is subtly different than deleting the old
<em class="mailheader">Content-Type</em> header and adding a new one with the new
boundary via <a class="reference internal" href="#email.message.Message.add_header" title="email.message.Message.add_header"><code class="xref py py-meth docutils literal notranslate"><span class="pre">add_header()</span></code></a>, because <a class="reference internal" href="#email.message.Message.set_boundary" title="email.message.Message.set_boundary"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_boundary()</span></code></a> preserves
the order of the <em class="mailheader">Content-Type</em> header in the list of
headers. However, it does <em>not</em> preserve any continuation lines which may
have been present in the original <em class="mailheader">Content-Type</em> header.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_content_charset">
<code class="descname">get_content_charset</code><span class="sig-paren">(</span><em>failobj=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_content_charset" title="永久链接至目标">¶</a></dt>
<dd><p>Return the <code class="docutils literal notranslate"><span class="pre">charset</span></code> parameter of the <em class="mailheader">Content-Type</em> header,
coerced to lower case.  If there is no <em class="mailheader">Content-Type</em> header, or if
that header has no <code class="docutils literal notranslate"><span class="pre">charset</span></code> parameter, <em>failobj</em> is returned.</p>
<p>Note that this method differs from <a class="reference internal" href="#email.message.Message.get_charset" title="email.message.Message.get_charset"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_charset()</span></code></a> which returns the
<a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instance for the default encoding of the message body.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_charsets">
<code class="descname">get_charsets</code><span class="sig-paren">(</span><em>failobj=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_charsets" title="永久链接至目标">¶</a></dt>
<dd><p>Return a list containing the character set names in the message.  If the
message is a <em class="mimetype">multipart</em>, then the list will contain one element
for each subpart in the payload, otherwise, it will be a list of length 1.</p>
<p>Each item in the list will be a string which is the value of the
<code class="docutils literal notranslate"><span class="pre">charset</span></code> parameter in the <em class="mailheader">Content-Type</em> header for the
represented subpart.  However, if the subpart has no
<em class="mailheader">Content-Type</em> header, no <code class="docutils literal notranslate"><span class="pre">charset</span></code> parameter, or is not of
the <em class="mimetype">text</em> main MIME type, then that item in the returned list
will be <em>failobj</em>.</p>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.get_content_disposition">
<code class="descname">get_content_disposition</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.get_content_disposition" title="永久链接至目标">¶</a></dt>
<dd><p>Return the lowercased value (without parameters) of the message's
<em class="mailheader">Content-Disposition</em> header if it has one, or <code class="docutils literal notranslate"><span class="pre">None</span></code>.  The
possible values for this method are <em>inline</em>, <em>attachment</em> or <code class="docutils literal notranslate"><span class="pre">None</span></code>
if the message follows <span class="target" id="index-11"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2183.html"><strong>RFC 2183</strong></a>.</p>
<div class="versionadded">
<p><span class="versionmodified">3.5 新版功能.</span></p>
</div>
</dd></dl>

<dl class="method">
<dt id="email.message.Message.walk">
<code class="descname">walk</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.Message.walk" title="永久链接至目标">¶</a></dt>
<dd><p>The <a class="reference internal" href="#email.message.Message.walk" title="email.message.Message.walk"><code class="xref py py-meth docutils literal notranslate"><span class="pre">walk()</span></code></a> method is an all-purpose generator which can be used to
iterate over all the parts and subparts of a message object tree, in
depth-first traversal order.  You will typically use <a class="reference internal" href="#email.message.Message.walk" title="email.message.Message.walk"><code class="xref py py-meth docutils literal notranslate"><span class="pre">walk()</span></code></a> as the
iterator in a <code class="docutils literal notranslate"><span class="pre">for</span></code> loop; each iteration returns the next subpart.</p>
<p>Here's an example that prints the MIME type of every part of a multipart
message structure:</p>
<div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="k">for</span> <span class="n">part</span> <span class="ow">in</span> <span class="n">msg</span><span class="o">.</span><span class="n">walk</span><span class="p">():</span>
<span class="gp">... </span>    <span class="k">print</span><span class="p">(</span><span class="n">part</span><span class="o">.</span><span class="n">get_content_type</span><span class="p">())</span>
<span class="go">multipart/report</span>
<span class="go">text/plain</span>
<span class="go">message/delivery-status</span>
<span class="go">text/plain</span>
<span class="go">text/plain</span>
<span class="go">message/rfc822</span>
<span class="go">text/plain</span>
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">walk</span></code> iterates over the subparts of any part where
<a class="reference internal" href="#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> returns <code class="docutils literal notranslate"><span class="pre">True</span></code>, even though
<code class="docutils literal notranslate"><span class="pre">msg.get_content_maintype()</span> <span class="pre">==</span> <span class="pre">'multipart'</span></code> may return <code class="docutils literal notranslate"><span class="pre">False</span></code>.  We
can see this in our example by making use of the <code class="docutils literal notranslate"><span class="pre">_structure</span></code> debug
helper function:</p>
<div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="k">for</span> <span class="n">part</span> <span class="ow">in</span> <span class="n">msg</span><span class="o">.</span><span class="n">walk</span><span class="p">():</span>
<span class="gp">... </span>    <span class="k">print</span><span class="p">(</span><span class="n">part</span><span class="o">.</span><span class="n">get_content_maintype</span><span class="p">()</span> <span class="o">==</span> <span class="s1">&#39;multipart&#39;</span><span class="p">),</span>
<span class="gp">... </span>          <span class="n">part</span><span class="o">.</span><span class="n">is_multipart</span><span class="p">())</span>
<span class="go">True True</span>
<span class="go">False False</span>
<span class="go">False True</span>
<span class="go">False False</span>
<span class="go">False False</span>
<span class="go">False True</span>
<span class="go">False False</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">_structure</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
<span class="go">multipart/report</span>
<span class="go">    text/plain</span>
<span class="go">message/delivery-status</span>
<span class="go">    text/plain</span>
<span class="go">    text/plain</span>
<span class="go">message/rfc822</span>
<span class="go">    text/plain</span>
</pre></div>
</div>
<p>Here the <code class="docutils literal notranslate"><span class="pre">message</span></code> parts are not <code class="docutils literal notranslate"><span class="pre">multiparts</span></code>, but they do contain
subparts. <code class="docutils literal notranslate"><span class="pre">is_multipart()</span></code> returns <code class="docutils literal notranslate"><span class="pre">True</span></code> and <code class="docutils literal notranslate"><span class="pre">walk</span></code> descends
into the subparts.</p>
</dd></dl>

<p><a class="reference internal" href="#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects can also optionally contain two instance attributes,
which can be used when generating the plain text of a MIME message.</p>
<dl class="attribute">
<dt id="email.message.Message.preamble">
<code class="descname">preamble</code><a class="headerlink" href="#email.message.Message.preamble" title="永久链接至目标">¶</a></dt>
<dd><p>The format of a MIME document allows for some text between the blank line
following the headers, and the first multipart boundary string. Normally,
this text is never visible in a MIME-aware mail reader because it falls
outside the standard MIME armor.  However, when viewing the raw text of
the message, or when viewing the message in a non-MIME aware reader, this
text can become visible.</p>
<p>The <em>preamble</em> attribute contains this leading extra-armor text for MIME
documents.  When the <a class="reference internal" href="email.parser.html#email.parser.Parser" title="email.parser.Parser"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parser</span></code></a> discovers some text
after the headers but before the first boundary string, it assigns this
text to the message's <em>preamble</em> attribute.  When the
<a class="reference internal" href="email.generator.html#email.generator.Generator" title="email.generator.Generator"><code class="xref py py-class docutils literal notranslate"><span class="pre">Generator</span></code></a> is writing out the plain text
representation of a MIME message, and it finds the
message has a <em>preamble</em> attribute, it will write this text in the area
between the headers and the first boundary.  See <a class="reference internal" href="email.parser.html#module-email.parser" title="email.parser: Parse flat text email messages to produce a message object structure."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.parser</span></code></a> and
<a class="reference internal" href="email.generator.html#module-email.generator" title="email.generator: Generate flat text email messages from a message structure."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.generator</span></code></a> for details.</p>
<p>Note that if the message object has no preamble, the <em>preamble</em> attribute
will be <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
</dd></dl>

<dl class="attribute">
<dt id="email.message.Message.epilogue">
<code class="descname">epilogue</code><a class="headerlink" href="#email.message.Message.epilogue" title="永久链接至目标">¶</a></dt>
<dd><p>The <em>epilogue</em> attribute acts the same way as the <em>preamble</em> attribute,
except that it contains text that appears between the last boundary and
the end of the message.</p>
<p>You do not need to set the epilogue to the empty string in order for the
<a class="reference internal" href="email.generator.html#email.generator.Generator" title="email.generator.Generator"><code class="xref py py-class docutils literal notranslate"><span class="pre">Generator</span></code></a> to print a newline at the end of the
file.</p>
</dd></dl>

<dl class="attribute">
<dt id="email.message.Message.defects">
<code class="descname">defects</code><a class="headerlink" href="#email.message.Message.defects" title="永久链接至目标">¶</a></dt>
<dd><p>The <em>defects</em> attribute contains a list of all the problems found when
parsing this message.  See <a class="reference internal" href="email.errors.html#module-email.errors" title="email.errors: The exception classes used by the email package."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code></a> for a detailed description
of the possible parsing defects.</p>
</dd></dl>

</dd></dl>

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